code: def test_document_store_class_with_documents_count():
      MyStore = document_store_class("MyStore", documents_count=100)
      store = MyStore()
      assert store.count_documents() == 100
      assert store.filter_documents() == []
  
file_path: haystack/test/testing/test_factory.py
imports: import pytest
  from haystack.dataclasses import Document
  from haystack.testing.factory import document_store_class, component_class
  from haystack.core.component import component
label_desc: Use image node_id 4 for calling a global function with example usage: test_document_store_class_with_documents_count() without return types